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KMID : 0896020080380020081
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Korean Journal of Oral and Maxillofacial Radiology
2008 Volume.38 No. 2 p.81 ~ p.87
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The relationship between 3D bone architectural parameters and elastic moduli of three orthogonal directions predicted from finite elements analysis
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Park Kwan-Soo
Lee Sam-Sun
Huh Kyung-Hoe
Yi Won-Jin
Heo Min-Suk
Choi Soon-Chul
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Abstract
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Purpose : To investigate the relationship between 3D bone architectural parameters and direction-related elastic
moduli of cancellous bone of mandibular condyle.
Materials and Methods : Two micro-pigs (Micro-pigR, PWG Genetics Korea) were used. Each pig was about 12
months old and weighing around 44 kg. 31 cylindrical bone specimen were obtained from cancellous bone of condyles
for 3D analysis and measured by micro-computed tomography. Six parameters were trabecular thickness
(Tb.Th), bone specific surface (BS/BV), percent bone volume (BV/TV), structure model index (SMI), degree of anisotropy
(DA) and 3-dimensional fractal dimension (3DFD). Elastic moduli of three orthogonal directions (superiorinferior
(SI), medial-lateral (ML), andterior-posterior (AP) direction) were calculated through finite element analysis.
Results : Elastic modulus of superior-inferior direction was higher than those of other directions. Elastic moduli of
3 orthogonal directions showed different correlation with 3D architectural parameters. Elastic moduli of SI and ML
directions showed significant strong to moderate correlation with BV/TV, SMI and 3DFD.
Conclusion : Elastic modulus of cancellous bone of pig mandibular condyle was highest in the SI direction and it
was supposed that the change into plate-like structure of trabeculae was mainly affected by increase of trabeculae of
SI and ML directions. (Korean J Oral Maxillofac Radiol 2008; 38 : 81-7)
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KEYWORD
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Architecture, Mandible, Micro-CT, Finite Element Analyses
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